High-frequency antenna



Jan. 29, 1952 MILLER 2,583,745

I HIGH-FREQUENCY ANTENNA Filed Dec. 2, 1948 INVENTOR. RODY MILLER ATTORNEYS Patented Jan. 29, 1952 -U N:I -=TED STATES PATENT ()FFICYE 2,583,745 HIGH:FR QU QY. Body Miller, Akron, Ohio Application December 2, 1948; Serial No. 62,997

(Cl. 250E3 3).

4 Claims.

'Ifh is invention relates to high frequency, antennas, and, v more particularly, is concerneduzith television receiving antennas,

, Heretofore, the. conventional television, receiw ing antenna has been, of, the dipole type and has been employed with one-or more directorsor reflectors. It is the conventional practice to installthese antennas as high as possible in order that,- they canbest receive; the high frequency television waves which are known to possess characteristics whereby the: receiving; antenna must be in substantially the line of; si ht of the transmitting: antenna, or must be so posi tioned, with respect lac-reflecting surfaces as; to pick up the transmitted signal; This has necessitated in conjunction; with the usual television receiving set a rather grotesque and unsightly antenna array which isoften objection-l able, from; an appearance standpoint, to say nothing of; the expense and dangerof installation. Ithas; also resulted-in; particularly elaborat an: tennat arrays in outlying districts remote from television transmitting stations; which arrays are even more expensive and. difficult to; install.

It. is; the general object of my invention to, avoid, an v r ome th foregoing and o h r diffi lti s f a dicbi cticns o prio known practices-by the, provision of; animproved high frequency; antenna. characterized by inexpensive: ness,, high. eificiency, and, case. at installation.

Another object of my invention is'theprovision ct al e visio ntenna 0f: he imple dipole typ util-izing-helically wound wire coils in assnciation witheachdegpof thedipole.

The; foregoing; objects of; my invention; and other objects which will become apparent as, the description; proceeds, are achieved by: the pro: v ion. of a; hi h. fr quen y wave; antenna; comprising a support, dipoles carried on the support in insulated relation to each other and to the support, each leg of the dipole being substantial- 1y equal in length-to the otherand to one-quarter ofthe wav lengthcf thewaveb ingh n l d by the antenna, or any full number; multiple thereof, electrical leads extending from each leg of the dipnlei a. helical; coil of: wire Surrounding each leg, of the dipole over substantially its full length, means insulating, each coil from. its dipole leg, the total length of thelwire ineach coil being preferably a full number multipleot the length. oi the dipole leg, and. the diameter of each coil; being greater than the diameter of each leg of the dipole.

For a better understanding of my invention,

reference should be had; to the accompanying 2 Rig: 2 is anenlarged sectional view taken,.sub-.- stantiall on line 2-2 of Fig. l;

3:is a diagrammatic showing of a folded dipqleincorporating the, principles of the invenr Fig. 4 is a perspective vievvoi a folded dipole made from a slotted tube;

Fig, 5 is a view. similar-tome. 3-.but shows a modif cation thereoi; and,

Eigfiis a side elevation illustrating a stacked array of different frequency antennas. utilizing the invention.

Having particular reference to the drawings, the numeral til indicates generally a support of any suitable type, forexample, comprisingmetalpipe or tubing connected by a coupling, [2 to a 'Rfitting IA, A second T fitting; [6 is secured to one leg of the T fitting I4, and secured in, the endsofthe T fitting I6 arepins [8 which are received suitable; holes in insulator spools 213., Fitting over each insulating Spool 20, is a metal tube 22 forming a legof thetwo-leg dipolethus produced, itbeing understood that the tubes 22" are cut to a; length equal to, each other and to any full number multiple of one-quarter wave length of the wave frequency being handled. Usually each tube-.22 isrcut to a, length substantially equal, to,- only. a single one-quarter; wave length. Electricalleads, Z-glareconnected to the dipole legs 22 inaccord with the usual practice,

Associated with, each of the, legs, or the dipole isra helical coil, 2510f Wire having, as indicated;

diameter, somewhat, greater thanthe diameterof the tube 22; anda beinginsulateda therefrom by; circumierentiallyspaced insulating strips; 28 which extend substantially the; full len thof the, tubes 22. It, will be; noted that eachcoil Zli likewise extends substantially the full length or?" its: associated; tube 22, and the overall length Of; l3hi':WlI 'in each coiLZBis preferably made, a full numb r. multipl of. o -quarterwav l n th it he hi h; ir en y avabei e rec iv d, Th coils 25 are not connected to; anythin andwh'ilfii hel 6.3 1 Pr m pms i ope a ion. l-9' I10?I u yuhde ts oodr it is i ve h t the. hi hrequen y av s. Picked up n e c ls 5' a induced; into the; dipole leg, 22.

The dipole array heretofore described isusualir emp oy d; conjunction with a u StflIlr tiallyconventional reflector which takes 1 the form of a shontbar or-t'ube, 30, connected, to, the other leg of the T I4 and terminating in a. T 3.1; which nturn; arries, efl ctor; tub s: 3 T pacin ,i een; herefiector tubes: at and; the dzinqla less 2 is conventional,

Ii-heends f; he tubes: a e. pr ferably rounded and closed, as indicated at 36, and this can be done either by upsetting the end of the tube 22 or by providing an auxiliary cap of similar character.

I have discovered that a high frequency antenna constructed in the manner described and when employed to receive television signals will give surprisingly unexpected and unusual results. This is not only true in outlyin districts where I have found that my improved antenna will pull in signals better than much more expensive and elaborate arrays, but is also true in locations closer to the broadcasting station. I have found, for example, that my improved antenna can often be merely hung in the room in which the television receiver is located, and does not even have to be put up on the roof in order to pick up an excellent picture. Tests with conventional television antennas in similar locations have failed to produce a satisfactory picture, or any picture at all.

' Having reference to Fig. 3 of the drawings, the numeral 40 indicates generally and diagrammatically an open-center folded dipole having leads 42. The open-center folded dipole can be made if desired by slotting a tube 44, as shown in Fig. 4, almost to its end. Coils 46 are wound around the legs of the dipole either around both legs simultaneously as shown in Fig. 3, or around each leg separately as seen in Fig. 5.

In Fig. 6 I have shown a stacked array of antennas 48, 50, and 52 constructed in accord with the invention and cut to different frequencies. Each antenna can be directed toward the transmitting station broadcasting its frequency by providing pivotal flange supports 54 which can be adjusted to and locked at th desired angle.

It should be mentioned that some of the advantages of the invention are realized when using a single leg type of antenna in association with a surrounding coil as described, and connecting this single leg antenna to one of the antenna posts on the receiver with the other antenna post on the receiver being connected to ground. This type of antenna when employed within a dozen or so miles of the transmitting station can be used right on top or behind the television receiver to pull in satisfactory pictures without the cost and complication of an outside antenna.

It, will be recognized from the foregoing that I have achieved the various objects of my invention, and have provided an improved, efiicient, relatively inexpensive and easily installed high frequency antenna particularly adapted for television u'se. I should note that the dipole legs of my antenna can be made from bars or rods, rather than tubing. I have also found from tests to date-that the diameter of the coils 26 relative to the diameter of the dipole legs does not appear to be too important, but I preferably make the difierences in diameter equal to a fraction of the wave length being received.

The term dipole as employed in the claims is intended to cover both folded and straight dipoles.

While certain representative embodiments and details have been shown for the purpose of illustrating the invention, it will be apparent to those skilled in this art that various changes and modifications may be made therein without departing from the spirit or scope of the invention.

I claim:

' '1. A high frequency wave antenna comprising a support, a two-leg dipole carried on the support, each leg in insulated relation to each other and to the support, each leg of the dipole bein substan- 4 tially equal in length to one quarter of the operating wave-length, electrical leads extending from each leg of the dipole, a helical coil of wire surrounding each leg of thedipole over substantially its full length, strip means spaced circumferentially around each leg of the dipole and insulating the coil therefrom, the total length of the wire in each coil being a full number multiple of the length of the dipole leg, and the diameter of each coil being greater than the diameter of each leg of the dipole.

2. A high frequency wave antenna comprising a support, a two-leg dipole carried on the support, each leg in insulated relation to each other and to the support, each leg of the dipole being substantially equal in length to the other and to one quarter of the wave-length of the operating length wave or a full number multiple thereof, electrical leads extending from each leg of the dipole, a helical coil of wire surrounding each leg of the dipole over substantially its full length, strip means spaced circumferentially around each leg of the dipole and insulating the coil therefrom, the total'length of the wire in each coil being a full number multiple of the length of the dipole leg, and the diameter of each coil being greater than the diameter of each leg of the dipole. V

3. A high frequency wave antenna comprising a support, a two-leg dipole carried on the support, each leg in insulated relation to each other and to the support, each leg of the dipole beingsubstantially equal in length to the other and to one quarter of the wave-length of the wave being handled by the antenna or a full number multiple thereof, electrical leads extending from each leg of the dipole, a helical coil of wire surrounding each leg of the dipole over substantially its full length, means insulating each coil from its dipole leg, the total length of the Wire ineach coil being a full number multiple of the length of the dipole leg, and the diameter of each coil being greater than the diameter of each leg of the dipole.

4. A high frequency wave antenna comprising a support, a two-leg dipole carried on' the support, each leg in insulated relation to each other and to the support, each leg of the dipole being substantially equal in length to the other and to one quarter of the wave-length of the Wave bein handled by the antenna or a full number multiple thereof, electrical leads extending from each leg of the dipole, a helical coil of wire surrounding each leg of the dipole over substantially its full length, and means insulating each coil from its dipole leg.

RODY MILLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

